Suction cup



FIG. 1 is a perspective view of my suction cup;

FIG. 2 is a top plan view of my suction cup;

FIG. 3 is a bottom plan view of my suction cup;

FIG. 4 is a side view of my suction cup with the opposite sides being mirror images thereof; and,

FIG. 5 is a longitudinal cross-sectional view thereof taken along line V--V of FIG. 2. 

The ornamental design for a suction cup, as shown and described. 